Yes, they recently upgraded their Inspire+ (plain white Safaris), Safari, and Dinosaur to 8500 mL capacity. The last time I ordered a case of Safaris there was no mention of it on the product page, except the capacity under the details section was listed as 8500 mL. I don't think they were even listed as Mega Safari at the time. I wasn't sure if it was a mistake or not so I e-mailed Rearz about it. Jacob replied to me and said they were doing a soft launch to get community feedback before they announced it. Now they have an official announcement on their website and the descriptions are updated on the Mega products.
I just went through almost a full case of the new Mega Safaris, and have another case on the way. Safari was always my favorite diaper so I was worried when they were changed. After using them however, I find they fit and feel exactly like the old Safaris when dry. So if you like those you should enjoy the new ones. I think they basically took the old ones and added more/better sap. They swell as much as the Critter Caboose, so they're not very discreet. The original ones weren't exactly discreet either so that's not an issue for me. I just wear something thinner outside of the house.
After using them for over a month now I can say they work very well! After getting used to the higher capacity of the newer Rearz diapers like Alpaca and Critter Caboose, I started to find the old Safaris a little lacking. I even had a few leaks with the older ones when I wet too heavily. The new ones absorb rapidly and keep you feeling dry. They start to swell right away but I don't have any issues with the wicking. I usually wear for an extended period so I wet while lying down or lift my butt to wet while sitting, so I can use the padding at the back more. I usually have them pretty evenly wet right to the back by the time I change.
I tested out their capacity a few times. I can wear one for over 16 hours while drinking lots of water, before the swelling starts to get uncomfortable and make the diaper tight. I can go to bed in a wet diaper and use it in the morning without any fear of leaking. I weighed one once after I changed and I had over 3L of liquid in there with no leaks! If someone wants a diaper for extended wear or just extra protection overnight these are great for that!